how do i equip custom secondary weapons on planes

[high anvil]

First of all, you need to own the aircraft in question xP

@slow harbor Once you've picked an aircraft you own and has this feature, right click on the plane, go to secondary weapons, and you'll see a "create" option in the bottom left

Once the loadout editor comes up, you can select each square to allocate a piece of ordnance to that pylon

Then, you can rename the preset, and hit save xP